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Dengue Fever
Dengue fever is caused by a virus transmitted through the bites of infected Aedes aegypti mosquitoes. The mosquitoes breed in artificial water containers and their bites can transmit four types of dengue virus. Dengue fever causes high fever, headaches, and joint pains. In severe cases it can lead to dengue hemorrhagic fever with bleeding and low platelet counts. There is no vaccine or specific treatment, so prevention focuses on eliminating mosquito breeding sites and protecting against bites.
Dengue Fever
- 1. Dengue Fever AhmedSiyahMaldivian Red Crescent
- 2. The Agent Breedwell in tropical climates
- 3. Life cycle completedin about 7 days
- 4. Life span of4 – 8 weeks
- 5. Locate bloodhosts byscent, sight and heat. They can smell your scent, especially the carbon dioxide you exhale 100 feet away (30 meters) and see you at 30 feet (10 meters).Aedesaegypti Small in size with white dots
- 6. Bites during daytime, especially at dawn and dusk
- 7. Prefers to layits eggs in artificial water containers, and does not fly far from breeding sites
- 8. Only female mosquitoesfeed on blood
- 9. One female mosquitomay lay 100 to 300 eggs at a time and may average 1,000 to 3,000 offspring during her life span.
- 10. The dengue virushas no detrimental effect on the mosquito, which remains infected for life, thereby spreading the virus.The Disease – Dengue FeverDengue is endemic in more than 110 countriesDengue fever is caused by a virus transmitted from person to person by mosquito during blood mealThe incubation period (time between exposure and onset of symptoms) ranges from 3–14 days, but most often it is 4–7 days.The virus has four different types
- 11. Dengue Fever contd...Canbe transmitted via infected blood products and through organ donation. Vertical transmission (from mother to child) during pregnancy or at birth has been reported.80% people infected with dengue virus are asymptomatic or only have mild symptoms such as an uncomplicated feverSevere disease is more common in babies and young children, and it is more common in children that are relatively well nourished
- 12. Symptoms of DengueFeverSudden-onset high grade fever (over 40 °C)Headache (typically located behind the eyes)Muscle and joint pains (break bone fever)Nausea and vomitingRashMild bleeding from mouth (gums) and noseLow white blood cell count
Editor's Notes
- #4 Mosquito’s salivary glands get infected 8 – 10 days after initial infection
- #5 infection with one virus type usually gives lifelong immunity to that type, but only short-term immunity to the others. Subsequent infection with a different type increases the risk of severe complications.
- #7 Fever caused by the immune response of the bodyA tourniquet test - A blood pressure cuff is applied and inflated to a point between the systolic and diastolic blood pressures for five minutes. The test is positive if there are 10 or more petechiae per square inch.
- #12 In as little as 6 generations (two months under ideal conditions) mosquitoes can build up immunity to a pesticide. If you rely on pesticide sprays and foggers, you will need more and more of them to do the job, and you will have to use them more and more often. The best way to make pesticides effective is to minimize their use. Make them your last choice, not your first choice.